[42875] in North American Network Operators' Group
Re: Data Center AC Issues
daemon@ATHENA.MIT.EDU (David VanHorn)
Mon Sep 24 22:25:09 2001
Message-Id: <4.3.2.7.2.20010924212402.027b6750@mail.cedar.net>
Date: Mon, 24 Sep 2001 21:26:16 -0500
To: <ainman@umich.edu>, <nanog@merit.edu>
From: David VanHorn <dvanhorn@cedar.net>
In-Reply-To: <Pine.GSO.4.32.0109242213010.28659-100000@myke.itd.umich.ed
u>
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At 10:18 PM 9/24/01 -0400, ainman@umich.edu wrote:
>Can anyone recommend an expert Troubleshooting/Design firm that has
>extensive experience with Data Center specifici AC issues?
>
>We have a strange problem (probably with the airflow/vents/arrangements) which
>has machines in various locations dying due to heat, when the ambient temp
>isn't above 90.
Are you monitoring your line voltage?
I've seen "normal" AC lines, in the US, anywhere from 70-140VAC.
Modern equipment use switcher power supplies, which draw more current as
the voltage goes lower.
Heat in the power supply is a function of current squared.
So, as the line voltage goes lower, the equipment gets hotter.
(paradoxical-seeming, ain't it?)
--
Dave's Engineering Page: http://www.dvanhorn.org
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